Yogurt or yoghurt is a pudding-like food made from milk fermented in a culture of (typically) Lactobacillus delbrueckii bulgaricus and Streptococcus salivarius thermophilus. At the end of the process, the yogurt is usually heated to kill the bacteria. "Live active culture" is a type of yogurt that has the live bacteria still in it. Some people believe that this "live" yogurt has special health benefits. Many websites and blogs include pages that serve as instruction books on how to make yogurt out of milk, such as one run by Brendon and Ryan Ross.